| http://www.w3.org/ns/prov#value | - If the plate is moved horizontally from a position at which one edge 40 of the notch intercepts the beam axis to a position at which the other edge 42 intercepts the beam axis (the manner in which such interception is detected is described below) it is seen that the horizontal travel L of the plate between the two positions is a linear function of the vertical height h of the beam axis.
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